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2. Three males with an X-linked genetic disorder have one child each. The random variable x is the number of children among the three who

2. Three males with an X-linked genetic disorder have one child each. The random variable x is the number of children among the three who inherit the X-linked genetic disorder.

x 0 1 2 3

P(x) 0.125 0.375 0.375 0.125

Determine whether it is a probability distribution or not. If it is a probability distribution, find its mean and standard deviation.

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